Place multiple columns at the intersection of selected grid lines.
 (Structural Column).
 (Structural Column). 
  Where is it?
 Structure panel
Structure panel
 (Structural Column)
 (Structural Column) 
 Build panel
Build panel Column drop-down
Column drop-down
 (Structural Column)
 (Structural Column) 
 Multiple panel
Multiple panel 
 
   (At Grids).
 (At Grids). 
 
 
 Multiple panel
Multiple panel 
 
   (Finish) to create the columns.
 (Finish) to create the columns.